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Version 1.1 – April 2021

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Table of Contents

1

Sensor Performance..................................................................................................................................... 3

1.1

CO2 Sensing Performance ...................................................................................................................... 3

1.2

Humidity Sensing Performance ............................................................................................................... 3

1.3

Temperature Sensing Performance5........................................................................................................ 3

2

Specifications ............................................................................................................................................... 4

2.1

Electrical Specifications........................................................................................................................... 4

2.2

Absolute Maximum Ratings..................................................................................................................... 4

2.3

Interface Specifications ........................................................................................................................... 5

2.4

Timing Specifications .............................................................................................................................. 6

2.5

Material Contents.................................................................................................................................... 6

3

Digital Interface Description......................................................................................................................... 7

3.1

Power-Up and Communication Start........................................................................................................ 7

3.2

Data type & length................................................................................................................................... 7

3.3

Command Sequence Types .................................................................................................................... 7

3.4

SCD4x Command Overview.................................................................................................................... 8

3.5

Basic Commands.................................................................................................................................... 9

3.6

On-Chip Output Signal Compensation................................................................................................... 10

3.7

Field Calibration.................................................................................................................................... 12

3.8

Low Power operation............................................................................................................................. 14

3.9

Advanced Features............................................................................................................................... 15

3.10 Low power single shot (SCD41) ............................................................................................................ 17

3.11 Checksum Calculation........................................................................................................................... 18

4

Mechanical specifications .......................................................................................................................... 19

4.1

Package Outline.................................................................................................................................... 19

4.2

Land Pattern ......................................................................................................................................... 19

4.3

Tape & Reel Package ........................................................................................................................... 20

4.4

Moisture Sensitivity Level...................................................................................................................... 20

4.5

Soldering Instructions............................................................................................................................ 21

4.6

Traceability ........................................................................................................................................... 21

5

Ordering Information .................................................................................................................................. 21

6

Revision History.......................................................................................................................................... 21